Furazabol reminds us of Stanozolol (Winstrol) strucrurally. Its similar in appearance in that it's a DHT molecule with a 17-alpha-methyl group for oral availability, and has no 3-keto group, needed for androgenic binding. But instead of a 2,3-pyrazol group, furazabol has a 2,3-furazan group. The difference may not be all that big, both groups contain 2 nitrogen atoms and 2 double bonds and both are present instead of the 3-keto group. The advantage is that its not readily deactivated and therefore whatever influences it has, they are consistent. The downside is that the lack of a 3-keto group, which will impair its overall androgenic potency. So in that aspect again comparable to stanozolol. Anabolics 2002, without a doubt the best reference guide for steroids in print, lists Furazabol as extremely androgenic however, which is no doubt just an oversight. In nearly every way the behaviour of furazabol would be identical to that of Stanozolol.
It's an obscure steroid, that's the least we can say. Its only manufactured in Japan and in tabs of 1 mg. Low availability makes the cost of this steroid rather high, and its not particularly easy to find. Perhaps a tad more potent than Stanozolol, the doses used lay in the same neighbourhood, 20-50 mg/day. The higher doses being the preference. The demand for it isn't very high either, because Winstrol/Stromba is a popular and cheap to come by. The only benefit of its obscurity is that noone will invest in faking it. So if you do come across Furazabol, you have pretty good odds that the stuff is legit.
Now, the literature does not make a whole lot of mention of furazabol, but from what I was able to find1, it supports the weak nature of the steroid. In one case it was found that furazabol was a good treatment for hyperlipemia, and this without affecting proteinuria (the prevention of excretion of amino acids, where one would expect a steroid to increase proteinuria and not effect hyperlipemia). The low androgen binding may explain the lack of effect it had on proteinuria. The doses used were considerably high though, at least for furazabol. 1.1 mg/kg/day. That means a 200 lb bodybuilder would be using around 90-100 mg/day
Furazabol can be considered a relatively light steroid therefore. It is not estrogenic in anyway, on account of its dihydro structure and its lack of estrogenic action and low androgenic binding make it have fairly little influence on the body's own testosterone production. Much like Winstrol (stanozolol) and Anavar (oxandrolone). In the long run suppression will occur of course, but because it occurs much slower a user will suffer less from testicular atrophy and therefore bounce back easier when a cycle is concluded. There is a slim chance of androgenic risk, as with Winstrol, but its not frequent or severe. So acne, increased body and facial hair and even an aggravation of male pattern hair loss can occur, but it's a lot less likely than with more androgenic specimen.
Furazabol is a 17-alpha-alkylated steroid, and therefore has a level of hepatoxicity. In the interest of protecting your liver, you should not extend use beyond 6-8 weeks maximum. It's a mild steroid with no estrogenic activity, so logically its best used when cutting in stacks with Equipoise (boldenone undecylenate), Finaplix (trenbolone acetate) or Primobolan (methenolone enanthate) and the needed fat-burners of course. Unlike most steroids, this drug has a relatively short half-life2 however. It compensates with quite long activity (15-33% excretion of unchanged metabolites after 24 hours) so a single dose should be enough to get you through the day. But on account of the low half-life time, you may want to consider splitting doses in two each day.
Because it doesn't aromatize and doesn't have a strong androgenic component, the use of ancillary drugs is limited. The use of Clomid or Nolvadex after a cycle is certainly advised, though the merit may be rather limited. There is no need for anti-estrogens or blood pressure medication during the cycle.